A damping adjustable slender structure and a method for regulating the same

Abstract

The application discloses a damping adjustable slender structure and a regulation and control method thereof, and aims to solve the problem of reducing the vibration of a slender support rod in a wind tunnel test. The slender structure comprises a mass block, an equal-straight section, an expansion section, and a rear cone section used for being connected with a model to be measured; the expansion section is in a circular truncated cone type along the axial section; the equal-straight section is in a rectangular type along the axial section; the mass block is arranged on the equal-straight section; the rear cone section, the expansion section and the equal-straight section are sequentially connected along the axial direction of the rear cone section; the rear cone section, the expansion section and the equal-straight section are integrally formed; the rear cone section is provided with a first through hole in the center; and the expansion section is provided with a second through hole in the center. Based on the additive manufacturing technology, the application integrates the porous point array material into the structural design of the wind tunnel support rod, can realize the passive damping regulation and control of the additive manufacturing slender structure with low cost and easy realization, reduces the vibration suppression of the slender structure, meets the requirement of rapid experiment, and has important significance.

Description

Technical Field

[0001] This invention relates to the field of wind tunnel testing, particularly to the field of vibration and noise control, specifically to a damped adjustable slender structure and its control method. More specifically, this application provides a damping control method for suppressing the vibration of additively manufactured slender structures, which can be used to suppress the vibration of support structures in wind tunnel testing, ensuring the accuracy of wind tunnel test data. Background Technology

[0002] Cantilever tail support systems are the most commonly used support method in wind tunnel testing, and the struts used are generally designed as slender solid structures (hereinafter referred to as slender struts). Under the broadband excitation of wind tunnel airflow pulsations, the solid struts used in cantilever tail support systems are prone to coupling with the incoming flow frequency, causing low-frequency, large-amplitude vibrations. This directly affects the accuracy of test data and, in severe cases, can even lead to the breakage of the tail strut, posing a significant safety hazard. Therefore, research on vibration suppression for slender structures is particularly important.

[0003] Methods for controlling the vibration of slender struts can be broadly categorized into active and passive control. Active control primarily utilizes smart materials such as piezoelectric ceramics as actuators, employing corresponding control strategies based on the measured vibration signals. This method offers advantages such as short response time and high vibration suppression accuracy, but the system is relatively complex, expensive, and sensitive to electromagnetic interference. Passive control mainly employs dampers or modifies the model structure to improve system stiffness, damping, and other parameters, achieving better vibration reduction. Its structure is simple and requires no energy input.

[0004] As mentioned earlier, the current object of vibration control is a slender solid support rod. How to reduce the vibration of slender support rods has become a hot research topic. Therefore, there is an urgent need for a new device or method to solve the above problems. Summary of the Invention

[0005] On the one hand, the rapid development of low-cost additive manufacturing technology is fundamentally changing the traditional manufacturing methods of slender structures. On the other hand, porous lattice materials, with their advantages of high specific strength and good energy absorption characteristics, are increasingly widely used in aerospace, marine transportation, and other fields. In view of this, this application addresses the problem of reducing vibration of slender struts in wind tunnel testing by providing a damping-adjustable slender structure and its control method. Based on additive manufacturing technology, this application integrates porous lattice materials into the structural design of wind tunnel struts, enabling low-cost and easily implemented passive damping control to suppress vibration in additively manufactured slender structures, thereby reducing vibration and meeting the needs of rapid experimental execution, which is of great significance.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A damping adjustable slender structure includes a mass block, a straight section, an extension section, and a rear conical section for connecting to the model under test;

[0008] The extended section has a frustum-shaped cross-section along its axial direction, the straight section has a rectangular cross-section along its axial direction, and the mass block is disposed on the straight section.

[0009] Along the axial direction of the rear cone section, the rear cone section, the extended section, and the straight section are connected in sequence, and the rear cone section, the extended section, and the straight section are integrally formed.

[0010] The rear conical section has a first through hole at its center, the extended section has a second through hole at its center, and the straight section has a third through hole at its center, with the first through hole, the second through hole, and the third through hole being connected sequentially.

[0011] The extended section includes a second outer shell and a second inner shell. The second outer shell has a frustum-shaped cross-section along its axial direction, and the second inner shell is located inside the second outer shell. The straight section includes a third outer shell and a third inner shell, and the third inner shell is located inside the third outer shell. A second adjustment space is formed between the outer wall of the second inner shell and the inner wall of the second outer shell, and between the outer wall of the third inner shell and the inner wall of the third outer shell. The second outer shell and the third outer shell are connected to form the main body of the outer shell.

[0012] The second space is provided with a honeycomb component, which is composed of a number of honeycomb-shaped cells connected in sequence;

[0013] A single honeycomb cell consists of six second spherical connection points and eighteen second connecting rods; the single honeycomb cell is divided into two layers, namely the second honeycomb layer one and the second honeycomb layer two; the second honeycomb layer one and the second honeycomb layer two are both regular hexagons in cross-section perpendicular to their axial direction; the projection of the second honeycomb layer one coincides with the projection of the second honeycomb layer two along the central axis of the second honeycomb layer one; three second spherical connection points are respectively provided on the second honeycomb layer one and the second honeycomb layer two in the single honeycomb cell; the three second spherical connection points are arranged alternately at the vertices of the regular hexagons in the second honeycomb layer one and the three second spherical connection points are arranged alternately at the vertices of the regular hexagons in the second honeycomb layer two in the single honeycomb cell; the second spherical connection points at the vertices of the regular hexagons in the second honeycomb layer one and the second spherical connection points at the vertices of the regular hexagons in the second honeycomb layer two are arranged alternately along the central axis of the second honeycomb layer one;

[0014] In a single honeycomb cell, the second spherical connection point located at the vertex of the regular hexagon in the second honeycomb layer one is connected to the second spherical connection point located at the vertex of the regular hexagon in the second honeycomb layer two through the second connecting rod. The second spherical connection points between the second honeycomb layer one and the second honeycomb layer two are connected as one unit by six second connecting rods.

[0015] Adjacent honeycomb cells share a second spherical connection point and a second connecting rod. Several honeycomb cells connected in sequence form a honeycomb assembly. The honeycomb assembly is located between the outer wall of the second inner shell and the inner wall of the second outer shell, and between the outer wall of the third inner shell and the inner wall of the third outer shell.

[0016] The pores in the honeycomb assembly form a second damping supplement gap between the outer wall of the second inner shell and the inner wall of the second outer shell, and between the outer wall of the third inner shell and the inner wall of the third outer shell. The outer shell body is provided with a second adjustment through hole, through which damping fluid can be added to the second damping supplement gap.

[0017] The central axis of the rear conical section, the central axis of the extended section, and the central axis of the straight section coincide with each other.

[0018] The first through hole, the second through hole, and the third through hole are connected in sequence to form a central through hole assembly, which can be used for wiring in a balance.

[0019] The second inner shell is in the shape of a cylindrical tube.

[0020] The third inner shell and the third outer shell are both cylindrical.

[0021] The straight sections are detachably connected to each other.

[0022] The second inner shell and the second outer shell, and the third inner shell and the third outer shell are connected as one unit by a honeycomb assembly.

[0023] The second spherical connection point is spherical, and the second connecting rod is columnar.

[0024] The second outer shell is provided with a second adjustment through hole, through which damping fluid can be added to the second damping replenishment gap.

[0025] It also includes a damping fluid, which is disposed within the second damping supplement gap.

[0026] In a single honeycomb cell, in the first second honeycomb layer, one end of a second connecting rod is connected to a second spherical connecting point and the other end of the second connecting rod is connected to one end of another second connecting rod; in a single honeycomb cell, in the second second honeycomb layer, one end of a second connecting rod is connected to a second spherical connecting point and the other end of the second connecting rod is connected to one end of another second connecting rod; six second connecting rods are respectively provided in the first second honeycomb layer and the second second honeycomb layer.

[0027] In the cellular assembly, in the first second cellular layer, one end of a second connecting rod is connected to a second spherical connection point and the other end of the second connecting rod is connected to one end of two other second connecting rods; in the second cellular assembly, in the second second cellular layer, one end of a second connecting rod is connected to a second spherical connection point and the other end of the second connecting rod is connected to one end of two other second connecting rods.

[0028] By adopting the aforementioned method for adjusting the damping slender structure, without changing the external dimensions of the model support rod, it is designed as a damping slender structure containing honeycomb components. By injecting a set amount of damping fluid into the inner cavity of the damping slender structure through the second adjustment through hole, the mechanical damping of the damping slender structure can be improved, thereby achieving vibration energy dissipation and meeting the requirements of wind tunnel testing.

[0029] Includes the following steps:

[0030] (1) Pre-determination

[0031] Without adding damping fluid inside the adjustable damping slender structure, a hammer impact modal test was conducted on the adjustable damping slender structure, and the vibration signal of the adjustable damping slender structure was collected to obtain the vibration signal of the blank group.

[0032] (2) Damping fluid filling

[0033] A set amount of damping fluid is injected into the inner cavity of the adjustable elongated structure through the second adjustment through hole. Then, a hammer impact modal test is performed on the adjustable elongated structure at this time, and the vibration signal of the adjustable elongated structure is collected to obtain the variable damping vibration signal.

[0034] (3) Damping adjustment

[0035] By comparing the vibration signal of the blank group in step (1) with the vibration signal of the variable damping in step (2), the amount of damping fluid added is adjusted, and step (2) is repeated until vibration information that meets the set requirements is obtained. The corresponding damping adjustable slender structure containing damping fluid is the structure that meets the set requirements.

[0036] To address the aforementioned problems, this application provides a damping-adjustable slender structure and its control method. Without altering the external dimensions of the model's support rod, this application employs a damping-adjustable slender structure design composed of honeycomb components, filling the honeycomb components with liquid damping material to enhance the mechanical damping of the slender structure and achieve vibration energy dissipation. Furthermore, this application enables the printing of prototypes of the damping-adjustable slender structure using additive manufacturing technology. Finally, through comparative experiments, the inventors analyzed the vibration reduction effect of the damping-adjustable slender structure before and after filling with damping liquid, fully verifying the effectiveness of the damping control method. Attached Figure Description

[0037] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related results can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a full sectional view of the damping adjustable slender structure of this application.

[0039] Figure 2 This is a cross-sectional view of the extended section perpendicular to its axial direction in the damping adjustable slender structure of this application.

[0040] Figure 3 This is an isometric view of a single honeycomb cell in this application.

[0041] Figure 4 for Figure 3 Top view.

[0042] Figure 5 This is a comparison curve of the frequency response of the damping adjustable slender structural support rod and the solid support rod of the same size in this application.

[0043] Figure 6 This is a sample drawing of the damping adjustable slender structural support rod in this application.

[0044] Figure 7 This is a diagram showing the measured results of the adjustable damping elongated structure in this application before it is filled with damping fluid.

[0045] Figure 8 This is a diagram showing the measured results of the adjustable damping elongated structure in this application after being filled with damping fluid.

[0046] The markings in the diagram are: 1. Mass block, 2. Straight section, 3. Extended section, 4. Rear conical section, 5. Second connecting rod, 6. Second spherical connection point, 7. Sample, 8. Second adjusting through hole. Detailed Implementation

[0047] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0048] Any feature disclosed in this specification, unless otherwise stated, may be replaced by other equivalent or similar features. That is, unless otherwise stated, each feature is merely one example of a series of equivalent or similar features.

[0049] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0050] Example 1

[0051] Figure 1 As shown, this embodiment provides a damping adjustable slender structure, which includes a mass block, a straight section, an extension section, and a rear conical section for connecting to the model under test. As shown, the extension section has a frustum-shaped cross-section along its axial direction, and the straight section has a rectangular cross-section along its axial direction. The mass block is disposed on the straight section. Along the axial direction of the rear conical section, the rear conical section, the extension section, and the straight section are connected sequentially. In this embodiment, the rear conical section, the extension section, and the straight section are integrally formed; the straight sections are detachably connected (specifically, a mass block is attached to the end of the straight section to equivalently represent the mass of the wind tunnel test model). In one example, the central axis of the rear conical section, the central axis of the extension section, and the central axis of the straight section coincide.

[0052] Simultaneously, a first through hole is provided at the center of the rear conical section, a second through hole is provided at the center of the extended section, and a third through hole is provided at the center of the straight section. The first, second, and third through holes are sequentially connected. Furthermore, the first, second, and third through holes sequentially connect to form a central through hole assembly, which can be used for the routing of the measuring balance in the model under test.

[0053] The extended section includes a second outer shell and a second inner shell. The second outer shell has a frustum-shaped cross-section along its axial direction, and the second inner shell is located within the second outer shell. Simultaneously, the straight section includes a third outer shell and a third inner shell, with the third inner shell located within the third outer shell. In this embodiment, the second inner shell is cylindrical, and both the third inner shell and the third outer shell are cylindrical; furthermore, the second and third inner shells are designed with equal diameters. As shown in the figure, a second adjustment space is formed between the outer wall of the second inner shell and the inner wall of the second outer shell, and between the outer wall of the third inner shell and the inner wall of the third outer shell.

[0054] The second space contains a honeycomb assembly, which is composed of several interconnected honeycomb cells. Specifically, the honeycomb assembly is located in the extended and straight sections of the support rod. As shown in the figure, the honeycomb assembly is formed by the orderly stacking of many honeycomb cells along the radial and axial directions of the damping-adjustable slender structure.

[0055] A single honeycomb cell consists of an octahedron formed by six second spherical connection points and eighteen second connecting rods; its orthographic projection can be considered as a regular hexagon. For example... Figure 3 As shown, a single honeycomb cell is divided into two layers, namely, second honeycomb layer one and second honeycomb layer two. The cross-sections of second honeycomb layer one and second honeycomb layer two perpendicular to their axial directions are both hexagonal. The projections of second honeycomb layer one and second honeycomb layer two coincide along the central axis of second honeycomb layer one. As shown in the figure, each of the second honeycomb cells has three second spherical connection points. These three points are spaced apart and positioned at three vertices of the hexagons in second honeycomb layer one and three vertices of the hexagons in second honeycomb layer two. Furthermore, along the central axis of second honeycomb layer one, the second spherical connection points at the vertices of the hexagons in second honeycomb layer one and second spherical connection points at the vertices of the hexagons in second honeycomb layer two are staggered.

[0056] In a single honeycomb cell, the second spherical connection point located at the vertex of the regular hexagon in the second honeycomb layer one is connected to the second spherical connection point located at the vertex of the regular hexagon in the second honeycomb layer two via a second connecting rod. The second spherical connection points between the second honeycomb layer one and the second honeycomb layer two are connected as one unit by six second connecting rods.

[0057] Adjacent honeycomb cells share a second spherical connection point and a second connecting rod. Several honeycomb cells connected in sequence form a honeycomb assembly. The honeycomb assembly is located between the outer wall of the second inner shell and the inner wall of the second outer shell, and between the outer wall of the third inner shell and the inner wall of the third outer shell.

[0058] Furthermore, within a single honeycomb cell, in the first second honeycomb layer, one end of a second connecting rod is connected to a second spherical connecting point, and the other end of the second connecting rod is connected to one end of another second connecting rod. Similarly, within a single honeycomb cell, in the second second honeycomb layer, one end of a second connecting rod is connected to a second spherical connecting point, and the other end of the second connecting rod is connected to one end of another second connecting rod. Six second connecting rods are respectively provided in the first and second second honeycomb layers.

[0059] From the perspective of the overall cellular assembly, the second connecting rod and the second spherical connection point are shared. Specifically, in the cellular assembly, in the first second cellular layer, one end of a second connecting rod is connected to the second spherical connection point, and the other end of the second connecting rod is connected to one end of two other second connecting rods; in the second cellular assembly, in the second second cellular layer, one end of a second connecting rod is connected to the second spherical connection point, and the other end of the second connecting rod is connected to one end of two other second connecting rods.

[0060] Simultaneously, the second outer shell and the third outer shell are connected as a whole, forming the main body of the outer shell. The pores within the honeycomb assembly form a second damping supplementary gap between the outer wall of the second inner shell and the inner wall of the second outer shell, and between the outer wall of the third inner shell and the inner wall of the third outer shell. A second adjustment through-hole is provided on the main body of the outer shell, through which damping fluid can be added to the inner second damping supplementary gap, thereby adjusting the overall damping. In a specific example, the second adjustment through-hole is located on the second outer shell, through which damping fluid can be added to the inner second damping supplementary gap; the second inner shell and the second outer shell are connected as a whole, and the third inner shell and the third outer shell are connected through the honeycomb assembly.

[0061] In this embodiment, the damping adjustable slender structure can be obtained by integral printing using additive manufacturing technology. Figure 6 Product images of the sample are provided. To meet printing process requirements, a second adjustment through-hole is pre-drilled in the circumferential direction of the honeycomb optimized support rod (i.e., the damping adjustable slender structure). The second adjustment through-hole is located at the non-contact point between the second outer shell and the honeycomb component material. Therefore, the second adjustment through-hole will not damage the honeycomb structure inside the honeycomb optimized support rod (i.e., the damping adjustable slender structure), ensures smooth powder dispensing, and facilitates the subsequent injection and replacement of liquid damping material (i.e., damping fluid).

[0062] Furthermore, based on finite element method (FEM) software, harmonic response analyses were performed on the damped adjustable slender structure and the uniform-sized solid support rod of this application. The uniform-sized solid support rod is a solid support rod without honeycomb lattice material filling. The frequency response curve of the center point of the mass block was extracted, and the experimental results are as follows: Figure 5 As shown, compared to a solid support rod of the same size, the resonance amplitude of the adjustable damping slender structure in this embodiment is significantly reduced, confirming that the adjustable damping slender structure of the present invention has a better effect. Further, simulation was performed. Simulation and experimental results show that the adjustable damping slender structure of this application has a high efficiency in absorbing vibration energy and a significant vibration suppression effect.

[0063] In this embodiment, impact modal tests were conducted on the sample, and vibration response signals of the adjustable damping slender structure were collected. Liquid damping material was injected into the inner cavity of the adjustable damping slender structure through the second adjustment through-hole, and the impact modal tests were repeated to obtain the vibration response signals of the adjustable damping slender structure after filling with damping liquid. The effectiveness of the damping control method was verified by comparing the modal damping ratios of the vibration response signals.

[0064] Furthermore, the aforementioned method for controlling the damping adjustable slender structure includes the following steps:

[0065] (1) Pre-determination

[0066] Without adding damping fluid inside the adjustable damping slender structure, a hammer impact modal test was conducted on the adjustable damping slender structure, and the vibration signal of the adjustable damping slender structure was collected to obtain the vibration signal of the blank group.

[0067] (2) Damping fluid filling

[0068] A set amount of damping fluid is injected into the inner cavity of the adjustable elongated structure through the second adjustment through hole. Then, a hammer impact modal test is performed on the adjustable elongated structure at this time, and the vibration signal of the adjustable elongated structure is collected to obtain the variable damping vibration signal.

[0069] (3) Damping adjustment

[0070] By comparing the vibration signal of the blank group in step (1) with the vibration signal of the variable damping in step (2), the amount of damping fluid added is adjusted, and step (2) is repeated until vibration information that meets the set requirements is obtained. The corresponding damping adjustable slender structure containing damping fluid is the structure that meets the set requirements.

[0071] According to the aforementioned method, impact modal tests were conducted. Following step (1) above, vibration signals from the blank group were collected, and the test results are as follows: Figure 7 As shown. Then, following the aforementioned step (2), a set amount of damping fluid is injected into the inner cavity of the adjustable elongated structure through the second adjustment through-hole. The hammer impact modal test is repeated, and the vibration signal of the adjustable elongated structure after filling with damping fluid is obtained. The results are as follows. Figure 8 As shown.

[0072] contrast Figure 7 , Figure 8 It is understood that the damping control method of this application accelerates the decay rate of the amplitude, that is, increases the modal damping ratio of the structure, and effectively suppresses the vibration of the additive manufacturing slender structure.

[0073] By adopting the solution of this application, the model support rod can be designed as a damping adjustable slender structure containing honeycomb components without changing its external dimensions. By injecting a set amount of damping fluid into the inner cavity of the damping adjustable slender structure through the second adjustment through hole, the mechanical damping of the damping adjustable slender structure can be improved, thereby achieving vibration energy dissipation and meeting the requirements of wind tunnel testing.

[0074] Furthermore, based on the damping adjustable elongated structure of this application, damping material can be injected into the inner cavity of the damping adjustable elongated structure through the second adjustment through hole; and the damping material can be flexibly replaced according to the vibration of the elongated structure under different excitation environments.

[0075] In summary, this application effectively suppresses the vibration of additively manufactured slender structures by modifying the structure of the support rod. The overall solution is simple, flexible, and highly applicable, providing a new method for vibration suppression of slender structures. This application employs a honeycomb component design, allowing damping material to be injected into the inner cavity of the adjustable slender structure through a second adjustment through-hole. After the damping material is injected, the mechanical damping of the adjustable slender structure is increased, thereby enhancing its vibration energy dissipation capability. Furthermore, this application allows for the replacement of the damping material based on the actual vibration of the additively manufactured slender structure under different excitation environments, meeting the application requirements of various conditions.

[0076] In summary, the above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A damping-adjustable slender structure, characterized in that, It includes a mass block, a straight section, an extended section, and a rear conical section for connecting to the model under test; The extended section has a frustum-shaped cross-section along its axial direction, the straight section has a rectangular cross-section along its axial direction, and the mass block is disposed on the straight section. Along the axial direction of the rear cone section, the rear cone section, the extended section, and the straight section are connected in sequence, and the rear cone section, the extended section, and the straight section are integrally formed. The rear conical section has a first through hole at its center, the extended section has a second through hole at its center, and the straight section has a third through hole at its center, with the first through hole, the second through hole, and the third through hole being connected sequentially. The extended section includes a second outer shell and a second inner shell. The second outer shell has a frustum-shaped cross-section along its axial direction, and the second inner shell is located inside the second outer shell. The straight section includes a third outer shell and a third inner shell, and the third inner shell is located inside the third outer shell. A second adjustment space is formed between the outer wall of the second inner shell and the inner wall of the second outer shell, and between the outer wall of the third inner shell and the inner wall of the third outer shell. The second outer shell and the third outer shell are connected to form the main body of the outer shell. The second adjustment space is provided with a honeycomb component, which is composed of a number of honeycomb cells connected in sequence; A single honeycomb cell consists of six second spherical connection points and eighteen second connecting rods; the single honeycomb cell is divided into two layers, namely the second honeycomb layer one and the second honeycomb layer two; the second honeycomb layer one and the second honeycomb layer two are both regular hexagons in cross-section perpendicular to their axial direction; the projection of the second honeycomb layer one coincides with the projection of the second honeycomb layer two along the central axis of the second honeycomb layer one; three second spherical connection points are respectively provided on the second honeycomb layer one and the second honeycomb layer two in the single honeycomb cell; the three second spherical connection points are arranged alternately at the vertices of the regular hexagons in the second honeycomb layer one and the three second spherical connection points are arranged alternately at the vertices of the regular hexagons in the second honeycomb layer two in the single honeycomb cell; the second spherical connection points at the vertices of the regular hexagons in the second honeycomb layer one and the second spherical connection points at the vertices of the regular hexagons in the second honeycomb layer two are arranged alternately along the central axis of the second honeycomb layer one; In a single honeycomb cell, the second spherical connection point located at the vertex of the regular hexagon in the second honeycomb layer one is connected to the second spherical connection point located at the vertex of the regular hexagon in the second honeycomb layer two through the second connecting rod. The second spherical connection points between the second honeycomb layer one and the second honeycomb layer two are connected as one unit by six second connecting rods. Adjacent honeycomb cells share a second spherical connection point and a second connecting rod. Several honeycomb cells connected in sequence form a honeycomb assembly. The honeycomb assembly is located between the outer wall of the second inner shell and the inner wall of the second outer shell, and between the outer wall of the third inner shell and the inner wall of the third outer shell. The pores in the honeycomb assembly form a second damping supplement gap between the outer wall of the second inner shell and the inner wall of the second outer shell, and between the outer wall of the third inner shell and the inner wall of the third outer shell. The outer shell body is provided with a second adjustment through hole, through which damping fluid can be added to the second damping supplement gap.

2. The damping adjustable slender structure according to claim 1, characterized in that, The first through hole, the second through hole, and the third through hole are connected in sequence to form a central through hole assembly, which can be used for wiring in a balance.

3. The damping adjustable elongated structure according to claim 1 or 2, characterized in that, The second inner shell and the second outer shell, and the third inner shell and the third outer shell are connected as one unit by a honeycomb assembly.

4. The damping adjustable slender structure according to claim 1, characterized in that, The second spherical connection point is spherical, and the second connecting rod is columnar.

5. The damping adjustable slender structure according to claim 1, characterized in that, The second outer shell is provided with a second adjustment through hole, through which damping fluid can be added to the second damping replenishment gap.

6. The damping adjustable slender structure according to claim 1, characterized in that, It also includes a damping fluid, which is disposed within the second damping supplement gap.

7. The damping adjustable elongated structure according to any one of claims 1 to 6, characterized in that, In a single honeycomb cell, in the first second honeycomb layer, one end of a second connecting rod is connected to a second spherical connecting point and the other end of the second connecting rod is connected to one end of another second connecting rod; in a single honeycomb cell, in the second second honeycomb layer, one end of a second connecting rod is connected to a second spherical connecting point and the other end of the second connecting rod is connected to one end of another second connecting rod; six second connecting rods are respectively provided in the first second honeycomb layer and the second second honeycomb layer.

8. The damping adjustable elongated structure according to any one of claims 1 to 7, characterized in that, In the cellular assembly, in the first second cellular layer, one end of a second connecting rod is connected to a second spherical connection point and the other end of the second connecting rod is connected to one end of two other second connecting rods; in the second cellular assembly, in the second second cellular layer, one end of a second connecting rod is connected to a second spherical connection point and the other end of the second connecting rod is connected to one end of two other second connecting rods.

9. The control method using any one of claims 1 to 8 of the preceding claims, characterized in that, Without changing the external dimensions of the model support rod, it is designed as a damping adjustable slender structure containing honeycomb components. By injecting a set amount of damping fluid into the inner cavity of the damping adjustable slender structure through the second adjustment through hole, the mechanical damping of the damping adjustable slender structure can be improved, so as to achieve vibration energy dissipation and meet the requirements of wind tunnel testing.

10. The control method according to claim 9, characterized in that, Includes the following steps: (1) Pre-determination Without adding damping fluid inside the adjustable damping slender structure, a hammer impact modal test was conducted on the adjustable damping slender structure, and the vibration signal of the adjustable damping slender structure was collected to obtain the vibration signal of the blank group. (2) Damping fluid filling A set amount of damping fluid is injected into the inner cavity of the adjustable elongated structure through the second adjustment through hole. Then, a hammer impact modal test is performed on the adjustable elongated structure at this time, and the vibration signal of the adjustable elongated structure is collected to obtain the variable damping vibration signal. (3) Damping adjustment By comparing the vibration signal of the blank group in step (1) with the vibration signal of the variable damping in step (2), the amount of damping fluid added is adjusted, and step (2) is repeated until vibration information that meets the set requirements is obtained. The corresponding damping adjustable slender structure containing damping fluid is the structure that meets the set requirements.

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